
\begingroup
\centering
\begin{tabular}{lcccc}
   \toprule
                                & (1)           & (2)          & (3)     & (4)\\  
   $\textbf{Orthophosphate (unfiltered)}$\\
   IHS restored wetland (acres) & 0.007$^{***}$ & 0.003$^{**}$ & 0.0007  & 0.0004\\   
                                & (0.001)       & (0.001)      & (0.002) & (0.002)\\   
   Ever-treated                 &               &              & X       & X\\  
    \\
   Dependent variable mean      & 0.18658       & 0.20038      & 0.26223 & 0.27086\\  
   Observations                 & 178,260       & 138,895      & 19,839  & 18,848\\  
   Adjusted R$^2$               & 0.27625       & 0.30281      & 0.33944 & 0.33794\\  
\end{tabular}
\par\endgroup


